1 /* $OpenBSD: v7.local.c,v 1.17 2016/07/19 06:43:27 deraadt Exp $ */ 2 /* $NetBSD: v7.local.c,v 1.8 1997/05/13 06:15:58 mikel Exp $ */ 3 4 /* 5 * Copyright (c) 1980, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Mail -- a mail program 35 * 36 * Version 7 37 * 38 * Local routines that are installation dependent. 39 */ 40 41 #include "rcv.h" 42 #include <stdlib.h> 43 #include <fcntl.h> 44 #include "extern.h" 45 46 /* 47 * Locate the user's mailbox file (ie, the place where new, unread 48 * mail is queued). 49 */ 50 void 51 findmail(char *user, char *buf, int buflen) 52 { 53 char *mbox; 54 struct stat sb; 55 56 /* Ignore $MAIL if it is not owned by the invoking user */ 57 if ((mbox = getenv("MAIL")) && stat(mbox, &sb) == 0 && 58 sb.st_uid != getuid() && sb.st_uid != geteuid()) 59 mbox = NULL; 60 61 if (mbox) 62 (void)strlcpy(buf, mbox, buflen); 63 else 64 (void)snprintf(buf, buflen, "%s/%s", _PATH_MAILDIR, user); 65 } 66 67 /* 68 * Get rid of the queued mail. 69 */ 70 void 71 demail(void) 72 { 73 int fd; 74 75 if (value("keep") != NULL || rm(mailname) < 0) { 76 fd = open(mailname, O_CREAT | O_TRUNC | O_WRONLY, 0600); 77 if (fd != -1) 78 close(fd); 79 } 80 } 81 82 /* 83 * Discover user login name. 84 */ 85 char * 86 username(void) 87 { 88 char *np; 89 uid_t uid; 90 91 if ((np = getenv("USER")) != NULL) 92 return(np); 93 if ((np = getenv("LOGNAME")) != NULL) 94 return(np); 95 if ((np = getname(uid = getuid())) != NULL) 96 return(np); 97 if ((np = getlogin()) != NULL) 98 return(np); 99 printf("Cannot associate a name with uid %u\n", (unsigned)uid); 100 return(NULL); 101 } 102